Just before Halloween, I went down to San Onofre State Park, and walked a good 4 miles up and down the beach in the afternoon, and just before sunset. It's a lovely park, but at $15 per car entry fee, and a 35+ minute drive away, I think I'll stick with my Dana Point beaches.
I pay $50 for a yearly permit, go to the beach 4 or 5 times a week, so it comes out to about 25 cents a visit to park at Salt Creek, and Strand Beach's parking is free (at least so far). Granted, the wildlife at San Onofre is more diverse, but the beach is harder to access and the incline of the sand from water line to dry berm is much steeper, making a long traverse less symmetrical and more one-sided. Plus, it takes me less than 20 minutes to get to Salt Creek or Strand, and that's a big selling point as well.
There's no where at San Onofre to really be able to do yoga, and there's no steps to do an aerobic work out either.